i have the load cell of 100kg i have a ADC NAU7802. i have to calculate weight through this ADC. can anyone have idea how to convert ADC value to weight.
An 8-bit processor can handle a 24-bit ADC and the related calculations. The "long" data type hides the complexities of manipulating integers larger than what the processor can handle natively.
The only thing to remember that two 24-bit numbers can't just be multiplied with each other - that would produce a 48-bit result where the low 24 bits will not contain any meaningful prevision.
But availability of a 32-bit integer type is more than enough for this task.